Electrochemical double-layer capacitors (EDLCs) have recently received an enormous attraction due to their ability to produce higher power density without compromising the durability. Producing cheaper, safer, and more durable devices obviously brings more benefits to the modern world applications. This investigation was carried out to optimize an ionic liquid (IL)–based gel polymer electrolyte (GPE), to fabricate an EDLC using the optimized electrolyte with natural graphite electrodes, and to characterize the performance of the device. Electrolyte was prepared with the IL, 1-ethyl-3-methylimidazolium chloride (1E3MICl); the polymer poly(vinylidenefluoride)-co-hexafluoropropylene (PVdF-co-HFP); and the salt, zinc chloride (ZnCl₂). The electrochemical properties of the electrolyte were evaluated by electrochemical impedance spectroscopy (EIS), DC polarization test, and linear sweep voltammetry (LSV), and the EDLC was characterized by EIS, cyclic voltammetry (CV), and galvanostatic charge–discharge (GCD) test. The optimum composition was found to be 26% PVdF-co-HFP:52% ZnCl₂:22% 1E3MICl (weight percentages) with the room temperature conductivity of 1.85 × 10⁻³ S cm⁻¹ and ionic transference number of 0.72. EDLC exhibited a single-electrode specific capacitance of 4.92 F g⁻¹ with 65% retention over 1000 cycles as per CV test. In the GCD results, the EDLC was able to held discharge capacitance of 3 F g⁻¹ for complete 1000 cycles. The durability of the EDLC with this IL-based GPE shows a great potential in the energy applications with further enhancements.

电化学双层电容器（EDLC）最近获得了巨大的吸引力，这是因为它们能够产生更高的功率密度而不损害耐用性。生产更便宜，更安全，更耐用的设备显然会为现代应用带来更多好处。进行这项研究的目的是优化基于离子液体（IL）的凝胶聚合物电解质（GPE），使用具有天然石墨电极的优化电解质来制造EDLC，并表征器件的性能。用IL，1-乙基-3-甲基咪唑鎓氯化物（1E3MIC1）制备电解液；聚合物聚偏二氟乙烯-共六氟丙烯（PVdF-co-HFP）；以及盐，氯化锌（ZnCl ₂）。通过电化学阻抗谱（EIS），直流极化测试和线性扫描伏安法（LSV）评估了电解质的电化学性质，并通过EIS，循环伏安法（CV）和恒电流充放电（GCD）对EDLC进行了表征。测试。发现最佳组成为26％PVdF-co-HFP：52％ZnCl ₂：22％1E3MICl（重量百分比），室温电导率为1.85×10 ^-3 S cm ^-1，离子转移数为0.72。根据CV测试，EDLC表现出的单电极比电容为4.92 F g ^-1，在1000个循环中保留了65％的电荷。在GCD结果中，EDLC能够保持3 F g ^-1的放电电容完整的1000个周期。具有这种基于IL的GPE的EDLC的耐用性在能源应用中显示出巨大的潜力，并具有进一步的增强。